CN115020627B - Electrode assembly and method for manufacturing the same - Google Patents

Electrode assembly and method for manufacturing the same Download PDF

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Publication number
CN115020627B
CN115020627B CN202210519479.4A CN202210519479A CN115020627B CN 115020627 B CN115020627 B CN 115020627B CN 202210519479 A CN202210519479 A CN 202210519479A CN 115020627 B CN115020627 B CN 115020627B
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China
Prior art keywords
unit cell
folded
electrode assembly
separation film
surround
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CN202210519479.4A
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Chinese (zh)
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CN115020627A (en
Inventor
金秀永
姜正焕
金鍾勳
河廷玟
辛秉镇
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LG Energy Solution Ltd
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LG Energy Solution Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/42—Grouping of primary cells into batteries
    • H01M6/46—Grouping of primary cells into batteries of flat cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Cell Separators (AREA)

Abstract

An electrode assembly and a method for manufacturing the same are provided. The electrode assembly includes a plurality of unit cells including at least one positive electrode, at least one negative electrode, and at least one separator, respectively, and a separation membrane folded to be disposed between the plurality of unit cells. The separation membrane is folded two or more times to contact and surround a first unit cell of the plurality of unit cells, the first unit cell being disposed at an initial position of the separation membrane.

Description

Electrode assembly and method for manufacturing the same
The present application is a divisional application of the inventive patent application entitled "electrode assembly and method for manufacturing an electrode assembly" having an application date of 2017, 10, 24, and application number of 201780058990.6.
Technical Field
Cross Reference to Related Applications
The present application claims priority from korean patent application No. 10-2016-0147929 filed in the korean intellectual property office at 11/8 of 2016, the disclosure of which is incorporated herein by reference.
Technical Field
The present invention relates to an electrode assembly and a method for manufacturing the electrode assembly.
Background
Unlike primary batteries, secondary batteries are rechargeable, and many researches on secondary batteries have been conducted in recent years due to the possibility of compact size and large capacity. As technology advances and demand for mobile devices increases, demand for secondary batteries as energy sources is rapidly increasing.
Secondary batteries are classified into coin-type batteries, cylindrical-type batteries, prismatic-type batteries, and pouch-type batteries according to the shape of a battery case. In such a secondary battery, an electrode assembly mounted in a battery case is a chargeable and dischargeable power generation device having a structure in which electrodes and separators are laminated.
The electrode assembly may be broadly divided into: a roll-up type electrode assembly in which a separator is interposed between a positive electrode and a negative electrode, each of the positive electrode and the negative electrode is provided in the form of a sheet coated with an active material, and then the positive electrode, the separator, and the negative electrode are wound; a stacked electrode assembly in which a plurality of positive electrodes and negative electrodes are sequentially stacked with separators therebetween; and a stacking/folding type electrode assembly in which the stacking type unit cell is wound with a separation film having a long length. Among them, the wrap-around electrode assembly is widely used because it has advantages of easy manufacturing and high energy density per unit weight.
Disclosure of Invention
Technical problem
An aspect of the present invention provides an electrode assembly and a method of manufacturing the same, in which the separation membrane is prevented from being unfolded and the electrodes are not exposed when a plurality of unit cells are folded together with the separation membrane.
Technical proposal
According to another aspect of the present invention, there is provided an electrode assembly including: a plurality of unit cells including at least one positive electrode, at least one negative electrode, and at least one separator, respectively; and a separation film folded to be disposed between the plurality of unit cells, wherein the separation film is folded two or more times to contact and surround a first unit cell of the plurality of unit cells, the first unit cell being disposed at an initial position of the separation film.
According to another aspect of the present invention, there is provided a method for manufacturing an electrode assembly, the method including: preparing a plurality of unit cells each including at least one positive electrode, at least one negative electrode, and at least one separator, and a separation membrane; disposing the plurality of unit cells on one surface of the separation membrane; and continuously folding the separation membrane having the unit cells disposed thereon such that the separation membrane is disposed between the plurality of unit cells, wherein in the folding, the separation membrane is folded two or more times to contact and surround a first unit cell of the plurality of unit cells, the first unit cell being disposed at an initial position of the separation membrane.
Advantageous effects
According to the present invention, in an electrode assembly in which a plurality of unit cells are folded together with a separation membrane, the separation membrane surrounding the unit cells disposed at the initial positions of the separation membrane can be prevented from being unfolded, and the electrodes can be not exposed, thereby improving the stability of the electrode assembly.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating an example of an electrode assembly according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of another example of an electrode assembly according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of an electrode assembly according to another embodiment of the present invention;
fig. 4 is a schematic cross-sectional view illustrating a method for manufacturing an electrode assembly according to still another embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating a method for manufacturing an electrode assembly according to still another embodiment of the present invention; and
fig. 6 is a schematic cross-sectional view illustrating a method for manufacturing an electrode assembly according to still another embodiment of the present invention.
Detailed Description
The objects, other objects, features and advantages of the present invention will be understood without difficulty by the following preferred embodiments related to the accompanying drawings. It should be noted that even though shown in different drawings, identical or similar parts in the drawings are indicated by identical reference numerals as possible. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Furthermore, detailed descriptions related to well-known functions or configurations will be omitted so as not to unnecessarily obscure the subject matter of the present disclosure.
Fig. 1 is a schematic cross-sectional view illustrating an example of an electrode assembly according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view illustrating another example of an electrode assembly according to an embodiment of the present invention.
Referring to fig. 1, an electrode assembly 100 according to an embodiment of the present invention includes a plurality of unit cells 110, 120, 130, 140, 150, and a separation film 160 folded to be disposed between the plurality of unit cells 110, 120, 130, 140, 150.
Hereinafter, an electrode assembly according to an embodiment of the present invention will be described in more detail with reference to fig. 1 and 2.
Each of the unit cells 110, 120, 130, 140, 150 is a chargeable/dischargeable power generation device, and has a structure in which at least one electrode 113 and at least one separator 114 are assembled and alternately stacked.
The electrode 113 may include a positive electrode 111 and a negative electrode 112. Also, the separator 114 separates the positive electrode 111 from the negative electrode 112 to electrically insulate the positive electrode 111 and the negative electrode 112 from each other.
Accordingly, one of the plurality of unit cells 110, 120, 130, 140, 150 may include at least one positive electrode 111, at least one negative electrode 112, and at least one separator 114.
The separator 114 is made of an insulating material, and the positive electrode 111, the separator 114, and the negative electrode 112 are alternately stacked.
Also, the separator 114 may be provided between the positive electrode 111 and the negative electrode 112, for example.
Also, for another example, the separator 114 may be disposed between the positive electrode 111 and the negative electrode 112, and may also be disposed on the outer surfaces of the positive electrode 111 and the negative electrode 112.
For example, the separator 114 may be a polyethylene film having micropores, a polypropylene film, or a multilayer film obtained by combining these films; or a polymer film for a polymer electrolyte or a gel-type polymer electrolyte, such as polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile, or polyvinylidene fluoride hexafluoropropylene copolymer.
The separation film 160 may be folded to be disposed between the plurality of unit cells 110, 120, 130, 140, 150.
Also, the separation film 160 may be folded two or more times to contact and surround the first unit cell 110 of the plurality of unit cells 110, 120, 130, 140, 150, the first unit cell 110 being disposed at an initial position of the separation film 160. Accordingly, the separation film 160 may completely surround the exposed portion of the electrode 113 of the first unit cell 110, thereby preventing the electrode 113 from being damaged. And, the separation film 160 surrounding the first unit cell 110 can be prevented from being spread.
The separation film 160 may include a first folded portion 161 folded once to surround the first unit cell 110 and a second folded portion 162 folded to additionally surround the first unit cell 110.
Here, the first folded portion 161 may be disposed to surround one surface and one side surface of the first unit cell 110, and the second folded portion 162 may be disposed to surround the other surface and the other side surface of the first unit cell 110. Here, for example, as illustrated in fig. 1, the first folded portion 161 may be provided to surround the top and left surfaces of the first unit cell 110, and the second folded portion 162 may be provided to surround the lower and right surfaces of the first unit cell 110.
Also, the outer surface of the first folded portion 161 is coated with an adhesive layer 161a along the folding direction to be adhered to a portion of the separation film 160 facing the outer surface of the first folded portion 161 when the first folded portion 161 is folded. Therefore, the separation film 160 surrounding the first unit cell 110 can be more effectively prevented from being spread.
Also, the first and second folded parts 161 and 162 may be disposed to surround the entire outer circumference of the first unit cell 110. For reference, although the first and second folded portions 161 and 162 are illustrated as if they were separate shapes in fig. 1, the first and second folded portions 161 and 162 may be a part of the long separation film 160 connected as one body.
Referring to fig. 1, the electrode assembly 100 according to an embodiment of the present invention may further include a fixing band 170 for preventing folding and unfolding of the separation membrane 160. Here, the fixing strap 170 may be attached from an end of the folded separation membrane 160 to a portion of the separation membrane adjacent to the end.
For example, referring to fig. 1, the separation membrane may be disposed to surround the plurality of unit cells 110, 120, 130, 140, and 150 in the same direction. That is, the plurality of unit cells 110, 120, 130, 140, 150 may be continuously provided on one side of the separation film 160 and continuously folded in one direction. Here, for example, the separation film 160 may surround the plurality of unit cells 110, 120, 130, 140, 150, and the folding direction of the plurality of unit cells 110, 120, 130, 140, 150 may be a clockwise direction or a counterclockwise direction.
Also, for another example, referring to fig. 2, the separation film 260 may be provided to continuously and alternately surround the plurality of unit cells 110, 120, 130, 140, 150 in different directions. That is, the separation film 260 may be provided to continuously and alternately surround the plurality of unit cells 110, 120, 130, 140, and 150 in the clockwise direction and the counterclockwise direction. For example, the separation film 260 may surround the first unit cell 110 disposed at the first position in a counterclockwise direction, surround the second unit cell 120 disposed at the second position in a clockwise direction, and surround the third unit cell 130 disposed at the third position in a counterclockwise direction, so that the separation film 260 continuously surrounds the plurality of unit cells 110, 120, 130, 140, and 150. Here, the portion of the separation film 260 including the first and second folded parts 261 and 262 may surround the first unit cell 110. In addition, the separation film 260 surrounds the entire outer circumferences of the plurality of unit cells 110, 120, 130, 140, and 150 to form the electrode assembly 200.
Fig. 3 is a schematic cross-sectional view of an electrode assembly according to another embodiment of the present invention.
Referring to fig. 3, an electrode assembly 300 according to another embodiment of the present invention includes a plurality of unit cells 110, 120, 130, 140, and 150, and a separation film 360 folded to be disposed between the plurality of unit cells 110, 120, 130, 140, and 150.
The electrode assembly 300 according to another embodiment of the present invention is different from the electrode assembly 100 according to the previous embodiment in that the first folded portion 361 of the separation film 360 surrounds the first unit cell 110.
Therefore, in this embodiment, descriptions repeated with those according to the foregoing embodiment will be briefly described, and differences will be mainly described.
The separation film 360 of the electrode assembly 300 according to another embodiment includes a first folded portion 361 and a second folded portion 362, the first folded portion 361 surrounding a portion of the first unit cell 110 among the plurality of unit cells 110, 120, 130, 140, and 150, the first unit cell 110 being disposed at an initial position of the separation film 360.
Here, the first folding portion 361 may be provided to surround one end (or a portion of the top surface) and one side surface of one surface of the first unit cell 110. That is, for example, in fig. 3, the first folding portion 361 may be provided to surround one end and the left surface of the top surface of the first unit cell 110.
Also, an adhesive may be applied to the inner surface of the first folding portion 361 in the folding direction to form the adhesive layer 361b. Accordingly, the first folding portion 361 may be adhered to the first unit cell 110 by the adhesive layer 361b. Accordingly, the first folding part 361 may be prevented from being unfolded in the first unit cell 110, and the separation film 360 surrounding the electrode assembly 300 may be prevented from being unfolded.
The second folded part 362 is disposed to surround the other surface and the other side surface of the first unit cell 110. That is, for example, in fig. 3, the second folded portion 362 may be disposed to surround the bottom surface and the right surface of the first unit cell 110.
Fig. 4 is a schematic cross-sectional view of a method for manufacturing an electrode assembly according to still another embodiment of the present invention.
Referring to fig. 4, a method for manufacturing an electrode assembly according to still another embodiment of the present invention includes: a preparation process of preparing a plurality of unit cells 110, 120, 130, 140, and 150 and a separation membrane 160; and a disposing step of disposing the plurality of unit cells 110, 120, 130, 140, and 150 on the separation film 160; and a folding process.
Hereinafter, a method for manufacturing an electrode assembly according to still another embodiment of the present invention will be described in more detail.
In more detail, referring to fig. 4, in the manufacturing process, a plurality of unit cells 110, 120, 130, 140, 150 and a separation membrane 160 are manufactured, and each of the plurality of unit cells 110, 120, 130, 140, 150 includes at least one positive electrode 111, at least one negative electrode 112, and at least one separator 114. Here, the separator 114 may be made of an insulating material, and the positive electrode 111, the separator 114, and the negative electrode 112 may be alternately stacked.
In the mounting process, a plurality of unit cells 110, 120, 130, 140, 150 are continuously mounted on the separation membrane 160 in one direction.
Also, in the mounting process, a plurality of unit cells 110, 120, 130, 140, 150 may be continuously arranged on the separation membrane 160. Here, when a distance between a first unit cell 110 of the plurality of unit cells 110, 120, 130, 140, 150 and a second unit cell 120 adjacent to the first unit cell 110 is defined as a1, a width of the first unit cell 110 is defined as w1, and a height of the first unit cell 110 is defined as h1, the unit cells 110, 120, 130, 140, 150 may be arranged to satisfy the following formula: 2 × w1+4 × h1<a1。
Also, in the folding process, the first unit cell 110 may be rotated at an angle of about 360 degrees or more such that the separation film 160 surrounds the circumference of the first unit cell 110.
In the folding process, the separation film 160, on which the plurality of unit cells 110, 120, 130, 140, 150 are disposed, may be continuously folded such that the separation film 160 is disposed between the plurality of unit cells 110, 120, 130, 140, 150.
Also, in the folding process, the separation film 160 may be folded at least twice to contact and surround the first unit cell 110 among the plurality of unit cells 110, 120, 130, 140, and 150, the first unit cell 110 being disposed at an initial position of the separation film 160. Here, the separation film 160 may include a first folded portion 161 folded once to surround the first unit cell 110 and a second folded portion 162 folded another time to surround the first unit cell 110.
And, the folding process may include: a first folding process of folding an end portion of the first separation film 160 in a direction of the first unit cell 110 such that the first folded portion 161 of the separation film 160 surrounds one surface and one side surface of the first unit cell 110; and a second folding process of rotating the first unit cell 110 at an angle of about 180 degrees such that the second folding portion 162 of the separation film 160 additionally surrounds the periphery of the first unit cell 110. Here, in the first folding process, the first folding portion 161 and the first unit cell 110 may be rotated and folded together. Here, the first folded part 161 may be folded to surround the first unit cell 110.
The folding process may include: an adhesive layer applying step of applying an adhesive layer 161a to an outer surface in a folding direction with respect to the first folding portion 161; and an adhesion process of adhering a portion of the separation film 160 facing the first folded portion 161 when folded to the adhesive layer 161a. Accordingly, the first folded portion 161 surrounding the first unit cell 110 can be effectively prevented from being unfolded.
Referring to fig. 1 and 4, in a method for manufacturing an electrode assembly according to still another embodiment, when the separation film 160 and the plurality of unit cells 110, 120, 130, 140, and 150 are folded, the first unit cell 110 disposed at the initial position of the separation film 160 is folded twice such that the separation film 160 surrounds the entire outer circumference of the first unit cell 110, the separation film 160 surrounding the first unit cell 110 disposed at the initial position of the separation film 160 is prevented from being frequently unfolded, and the electrodes 113 of the first unit cell 110 are prevented from being easily exposed. Also, the electrode assembly 100 and the secondary battery mounted with the electrode assembly 100 may improve stability by a strong folding and coupling structure.
Fig. 5 is a schematic cross-sectional view of a method for manufacturing an electrode assembly according to still another embodiment of the present invention.
Referring to fig. 5, a method for manufacturing an electrode assembly according to still another embodiment of the present invention includes a manufacturing process, a seating process, and a folding process for manufacturing a plurality of unit cells 110, 120, 130, 140, and 150 and a separation film 260.
The method for manufacturing an electrode assembly according to still another embodiment of the present invention is different from the method for manufacturing an electrode assembly according to still another embodiment of the present invention in that the first folded portion of the separation film 260 surrounds the first unit cell 110 before the first unit cell 110 rotates.
Therefore, in this embodiment, descriptions repeated with those according to still another embodiment will be briefly described, and differences will be mainly described.
Referring to fig. 1 and 5, in the mounting process, a plurality of unit cells 110, 120, 130, 140, 150 are mounted on one surface of a separation membrane. Here, the separation film may include a first folded portion 161 folded once to surround the first unit cell 110 and a second folded portion 162 folded another time to surround the first unit cell 110. Here, when the first unit cell 110 is disposed on the separation film, the first unit cell 110 may be disposed to be spaced apart from an end of the separation film by a predetermined distance such that the first folded portion 161 of the separation film 160 is disposed between the first unit cell 110 and the end of the separation film, the first unit cell 110 being disposed at an initial position of the separation film.
Also, referring to fig. 5 (a), in the mounting process, a plurality of unit cells 110, 120, 130, 140, 150 may be continuously arranged on the separation membrane 260. Here, when a distance between a first unit cell 110 of the plurality of unit cells 110, 120, 130, 140, 150 and a second unit cell 120 adjacent to the first unit cell 110 is defined as a2, a distance between an end of the separation film 260 and the first unit cell 110 is defined as a3, a width of the first unit cell 110 is defined as w1, and a height of the first unit cell 110 is defined as h1, the unit cells 110, 120, 130, 140, and 150 may be arranged to satisfy the following formula: 1 Xw1+3 Xh1 < a2 and 1 Xw1+1 Xh1 < a3.
The folding procedure comprises the following steps: a first folding step of folding the first folding portion 161 to the first unit cell 110; and a second folding process of rotating the first unit cell 110 at an angle of about 180 degrees such that the second folding portion 162 surrounds the circumference of the first unit cell 110.
Here, in the first folding process, the first folding portion 161 of the separation film 260 is folded to surround the first unit cell 110. Here, for example, the first folded part 161 may be folded to surround one side and one surface of the first unit cell 110. That is, for example, in fig. 5 (b), the first folded portion 161 may be folded to surround the right and top surfaces of the first unit cell 110.
Fig. 6 is a schematic cross-sectional view illustrating a method for manufacturing an electrode assembly according to still another embodiment of the present invention.
Referring to fig. 6, a method for manufacturing an electrode assembly according to still another embodiment of the present invention includes a manufacturing process, a seating process, and a folding process for manufacturing a plurality of unit cells 110, 120, 130, 140, 150 and a separation film 360. Here, the folding process includes a first folding process of performing one folding and a second folding process of performing two folding.
The method for manufacturing an electrode assembly according to still another embodiment of the present invention is different from the method for manufacturing an electrode assembly according to still another embodiment and another embodiment of the present invention in that the first folding part 361 of the separation film 360 is folded to one end and one side of one surface of the first unit cell 110.
Therefore, in this embodiment, descriptions repeated with those according to still another embodiment and the description of still another embodiment will be briefly described, and differences will be mainly described.
Referring to fig. 3 and 6, in a method for manufacturing an electrode assembly according to still another embodiment of the present invention, in a first folding process, a first folding portion 361 may be folded to surround one end (or a portion of the top surface) and one side surface of one surface of a first unit cell 110. Accordingly, the exposure of the electrode 113 of the first unit cell 110, which is a weak point in the related art, can be prevented, and the separation film 360 can be prevented from being unfolded after being folded.
And, the first folding process may further include: an adhesive applying step of applying an adhesive to the inner surface along the folding direction of the first folding portion 361 to form an adhesive layer 361b; and an adhesion process of adhering the first folded portion 361 to the first unit cell 110 through the adhesive layer 361b. Accordingly, the first folding part 361 may be prevented from being unfolded from the first unit cell 110, and the separation film 360 surrounding the electrode assembly 300 may be prevented from being unfolded.
In the first folding process, for example, air may be injected into the first folding portion 361 of the separation film 360 to fold the first folding portion 361 to the first unit cell 110. Here, air may be injected by an air compressor.
Also, in the first folding process, as another example, the first folding portion 361 may be folded to the first unit cell 110 by zigzagging (zig-zag).
Further, in the first folding process, as yet another example, the first folding portion 361 may be folded to the first unit cell 110 by an insertion mechanism (insertion mechanism).
In the first folding step, the first folding portion 361 can be folded by gravity, as a further example. Here, when the first folding portion 361 is horizontally disposed and a portion other than the first folding portion is fixed, the first folding portion 361 may be folded by gravity. That is, the portions other than the folded portion may be fixed, and the folded portion may be horizontally disposed to fold the first folded portion 361 by using gravity.
The specific embodiments of the present invention have been described in detail above, but the foregoing description of the present invention is merely illustrative, and the electrode assembly and the method for manufacturing the electrode assembly in the present invention are not limited thereto. Various changes in form and details may be made therein by one of ordinary skill in the art without departing from the spirit and scope of the present invention as defined by the following claims.
The specific protection scope of the present invention is clearly confirmed by the claims.

Claims (2)

1. An electrode assembly, comprising:
a plurality of unit cells including at least one positive electrode, at least one negative electrode, and at least one separator, respectively; and
a separation membrane folded to be disposed between the plurality of unit cells,
wherein the separation membrane is folded two or more times to contact and surround a first unit cell of the plurality of unit cells, the first unit cell being disposed at an initial position of the separation membrane; and is also provided with
Wherein the separation film includes a first folded portion folded once to surround the first unit cell and a second folded portion folded another time to surround the first unit cell;
wherein the first folded part surrounds one end and one side of one surface of the first unit cell, and an adhesive layer is disposed on the inner surface of the first folded part in a folding direction such that the first folded part is adhered to the first unit cell by the adhesive layer, and
the second folded part surrounds the other surface and the other side of the first unit cell.
2. The electrode assembly according to claim 1, wherein the first and second folded parts surround the entire outer circumference of the first unit cell.
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EP3416225A1 (en) 2018-12-19
JP6693649B2 (en) 2020-05-13
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US20180130985A1 (en) 2018-05-10
JP2019507948A (en) 2019-03-22
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KR20180051072A (en) 2018-05-16
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